Find how many grams of uranium are in each pitchblende
Approximately 1 atom of U-235 is present for each 140 atoms of uranium in the substance called pitchblende. If 84.8% of pitchblende is uranium (by mass), find how many grams of U-235 are in each 1 kg of pitchblende.
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The birth control shot is one of most effective methods of birth control available, and it works best when you get the shot regularly, every 12 weeks.
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Evaluate mass fraction of uranium in U3O8. Suppose average mass number of uranium is 238 and te average mass number of oxygen is 16.
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